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Re: Common block conumdrum [message #8431 is a reply to message #8355]

Tue, 04 March 1997 00:00

wonko
Messages: 22
Registered: March 1997

Junior Member

williams@skrymir.srl.caltech.edu (Daniel Williams) wrote:

> When developing programs in IDL, I often work with common blocks.
> However, if I try to change the definition of an existing common
> block, I get an error because it IDL thinks that I am trying to use a
> pre-existing common block in a naughty manner. According to the
> user's manual (v3.6 p6-10) this is what IDL should do.
> However, when creating new programs, I often want to change the
> definition of the common block as the program developes. How can I do
> this, short of exiting IDL and starting over? Is there some "delvar"
> equivalent for deleting common blocks or programs from memory?

I don't think there is any. So I just exit IDL and restart -- our SUNs
are getting faster and faster :)
Another idea would be the usage of global variables. They can be created
and changed with DEFSYSV at the main level.
I usually prefer this, only in my actual project I use common blocks,
just out of curiousity, I wanted to know what's so hot about them. Are
there drawbacks I don't see?

Alex
--
Alex Schuster Wonko@weird.cologne.de
alex@pet.mpin-koeln.mpg.de

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[Message index]

		Common block conumdrum By: williams on Mon, 03 March 1997 00:00
		Re: Common block conumdrum By: Phil Williams on Wed, 05 March 1997 00:00
		Re: Common block conumdrum By: J.D. Smith on Wed, 05 March 1997 00:00
		Re: Common block conumdrum By: Struan Gray on Wed, 05 March 1997 00:00
		Re: Common block conumdrum By: wonko on Tue, 04 March 1997 00:00
		Re: Common block conumdrum By: David Foster on Tue, 04 March 1997 00:00
		Re: Common block conumdrum By: Phil Williams on Tue, 04 March 1997 00:00
		Re: Common block conumdrum By: brian.jackel on Tue, 04 March 1997 00:00
		Re: Common block conumdrum By: david.eldon on Fri, 16 May 2014 14:07

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